The Alpinas run on non run flat tyres, have a much, much better ride even on the 20" wheels which I hate the look of. If you want an LSD you can get a Quaife LSD from Birds for xDrive and sDrive cars. I also feel that the steering wheel is not as elegant as the M Sport one + the Alpina badges are very 70s in looks. Yuck. Very pricy proposition but there is a lot of hand re-building involved. It is supposed to be a brilliant drive.
Present: Superman 330d sDrive M Sport + Toys (Auto Car: 0-60 in 5.5s, 0-100 in 14.2s, 30-70 in 5.1s)
Ordered: Red Tornado Golf 7R 5 Dr, DSG + Toys (Top Gear: 0-60 in 4.5s, 0-100 in 11.5s, 30-70 in 4.0s)